Recommended tapping and clearance drill sizes

ISO Metric Course Thread
d1 mm	Pitch mm	d2 mm	d3 mm		d1 mm	Pitch mm	d2 mm	d3 mm
1.0	0.25	0.75	1.05		11.0	1.50	9.50	11.20
1.1	0.25	0.85	1.15		12.0	1.75	10.20	12.20
1.2	0.30	0.95	1.25		14.0	2.00	12.00	14.25
1.4	0.30	1.10	1.45		16.0	2.00	14.00	16.25
1.6	0.35	1.25	1.65		18.0	2.50	15.50	18.25
1.8	0.35	1.45	1.85		20.0	2.50	17.50	20.25
2.0	0.40	1.60	2.05		22.0	2.50	19.50	27.25
2.2	0.45	1.75	2.25		24.0	3.00	21.00	24.25
2.5	0.45	2.05	2.60		27.0	3.00	24.00	27.25
3.0	0.50	2.50	3.10		30.0	3.50	26.50	30.50
3.5	0.60	2.90	3.60		33.0	3.50	29.50	33.50
4.0	0.70	3.30	4.10		36.0	4.00	32.00	36.50
4.5	0.75	3.70	4.60		39.0	4.00	35.00	39.50
5.0	0.80	4.20	5.10		42.0	4.50	37.50	42.50
6.0	1.00	5.00	6.10		45.0	4.50	40.50	45.50
7.0	1.00	6.00	7.20		48.0	5.00	43.00	48.50
8.0	1.25	6.80	8.20		52.0	5.00	47.00	53.00
9.0	1.25	7.80	9.20		56.0	5.50	50.50	57.00
10.0	1.50	8.50	10.20